Ultrafast investigation of exciton dissociation processes in polymeric semiconductors at high pump fluence

被引：0
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作者：
Russell, DM [1 ]
Essex, RJ [1 ]
Friend, RH [1 ]
Setayesh, S [1 ]
Müllen, K [1 ]
Silva, C [1 ]
机构：
[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England
来源：
ULTRAFAST PHENOMENA XIII | 2003年 / 71卷
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中图分类号：
O59 [应用物理学];
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摘要：
We report intensity-dependent femtosecond transient absorption measurements to explore the photophysics of a model step-ladder pi-conjugated polymer. At low pump fluence, the lowest-lying singlet exciton (1B(u)) is the only photoexcitation, but at high fluence triplet-exciton and polaron absorption features are evident in ultrafast timescales (within 100 fs). We find a two-step photogeneration mechanism for these long-lived species, with the 1B(u) exciton as the intermediate. Detailed photophysical modelling reveals that the effective yield of sequentially excited species is 15%, with a branching ratio of triplet-excitons to polarons similar to 5%.
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页码：377 / 379
页数：3
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